Flue-cutter.



PATBNTED NOV. 12, 1907.

G SORENSON PLUB CUTTER.

TION FILED MAR 23, 1907 GILBERT SORENSON, OF CASSELTON, NORTH DAKOTA.

FLUE-CUTTER.

Specication of Letters Patent.

Patented Nov. 12, 1907.

Application letl March 23, 1907l Serial No. 364.077.

To all whom it may concern:

Beitknown that I, GILBERT SonENsoN, a citizen of the United States, residing at Casselton, in the county of Oass'and State of North Dakota, have invented certainnewand useful Improvements in Flue-(lutters, of which the following is a specification.

This invention contemplates certain new and useful improvements in tools for cutting boiler flues and the inventionhas for its object a cheap, simple and ellicientconstruction of tool of this character which will enable the operator to stand on the outside of the fire boxfand accomplish the. desired work instead of being compelled to operate from the inside, where the cramped `position will materially interfere with the work.

The invention consists in certain constructions, arrangementsmnclcombinations of the parts which I shall now hereinafter fully describe and then point out the novel features in the appended claims.

For a full understanding of the invention andthe merits thereof and also to acquire a knowledge of the details of construction of the means for effecting the result, reference is to be had to the vfollowing description and accompanying drawings, in which:

Figure l is a perspective view of my improved flue cutter; Fig. 2 is a longitudinal sectional view thereof; Figs. 3 and 4 are transverse sectional views, the cutter being shown in different positions in the respective views; Fig. 5 is a transverse sectional view on the lino 5-5 of Fig. 2; and, Figs. G, 7 and S are detail perspective views of the types of cutters that may be employed.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Referring to the drawings, the numeral l designates the stock of my improved flue cutting tool, the same being designed to Ht loosely within a flue and being formed at a point intermediate of its ends with a circular eccentrically positioned socket 2 with which a segmental slot 3 communicates, the said slot extending radially, as shown.

Each cutter for the tool is provided with a circular shank or head 4 adapted to fit in the circular socket 2 and provided with a marginal recess 5 by which it may pass the somewhat contracted mouth of the socket 2, asit is inserted therein through the slot 3. After being inserted in the socket, the cutter is prevented from becoming accidentally disengaged therefrom inthe cutting operation, as the cutter can only be detached from the socketY and inserted therein when the recess 5 registers with one side of the contracted mouth of the socket. When in operation the cutters will be turned so as to lie against one side wall Vof the slot 3, in which position the said marginal recess 5 will be out of registry With the contracted mouth of the socket and the cutter will thus be securely held in place. lhc stock l is provided with non-circular end sockets l. in which the bars 7 and S [it and in which they are secured by means of taper pins or keys 9. One of these bars is sufficiently long to extend through the flue that is intended to be cut, While the other is relatively short On the first named bar a washer l() is adapted to t under certain conditions of service, in which event also there is a spring llback of the washer and encircling the bar, a follower Vl2 is slidingly mounted on the bar back of the spring and bearing thereagainst and formed with oppositely extending studs I3, said studs being adapted for engagement by an eccentric 14 on the forked lever l5 which is fulcruuied on a collar lo adjustably held on the bar by means of a set screw.

In the present instance I have shown three different forms of cutters designated A, li and (I. The cutter A is designed to cut the flue on the inside of the boiler and is of such a length that its pointed cutting end 1T will project from the stock l when the latter is turned in one position to cut the flue, the cutter resting against one side wall of the slot 3 whereas when thc stock is turned in the opposite direction, the said cutter will lie against the opposite wall of the stock substantially flush with thc surface of the stock, so as to in no wise interfere with the insertion and withdrawal of the tool in and from the flue, it being remembered that; the socket 2 is ecccntrically located with respect to the socket.

The cutter B is designed to cut the bead of the flue and is provided with a recessed and beveled cutting edge I8 which will prevent the tool from cutting any farther than to the flue sheet, because the point of the tool which extends outside of the flue is ground off round away from the [lue sheet and therefore will not damage the saine. In the practical operation of this cutter, the stock is first slipped through the flue, the cutter is then slipped into place, the washer 10 is slipped over the longer bar and lies against the flue sheet. The coiled spring is then placed on the bar back of the washer and the other intermittent parts are properly positioned and the eccentric lever is turned towards the'llue sheet so as to give the proper tension on the spring and cause the tool in the re box end of the flue to cut the bead of f when the tool is given one turn by means of power applied to the relatively short bar.

The cutter (l is designed to cut a new flue the exact length required, and this is accomplished in the same manner as in cutting off the bead. In connection with the cutter C, it is to be noted that it is formed with a cutting edge I9 and an offset end 20 which latter forms a guide adapted to ride upon the outer face of the .fluo sheet. Hence, the cut will be formed according to the `flue sheet and not necessarily straight around the flue, thisfeaturc heilig obviously of great importance with a crooked flue sheet.

lt is manifest that when the lueis cut at the front end the tool is reversed and the bars also reversed, the tool being turned to the left instead of to the right as in the foregoing operation.

From the foregoing description in connection with the accompanying drawings, it will be seen that I have provided a very simple, durable and efficient construction of iiue cutter which will wear a long time, as there are no parts to wear out except the cutters and as they are removable, they may he easily ground and replaced, or new ones may he easily made and substituted for the old ones. Furthermore the cutters themselves may he manufactured so cheaply that a plurality oi sets m ay be sold withthe one tool.

Having thus described the invention, what is claimed as new is:

l. A flue cutter, embodying a stock formed with an eccentrically located socket and a segmental slot communicating therewith, the socket being provided with a contracted mouth leading from the slot, and a cutter provided with a round head adapted to tit in said socket and formed with a marginal recess and adapted to register with the contracted mouth s0 as to permit the cutter to be slipped in and withdrawn from the socket.

2. A flue cutting tool, embodying' a stock and a cutter secured thereto, said cutter being provided with an offset cured to said stock, one of said bars being adapted for use in turningr the stock, a washer adapted to t on the other bar, a spring encircling said bar and adapted to bear against said washer, a follower slidingly mounted on the bar back of the spring and bearing thereagainst, and an eccentric lever fulcrumed on the bar and adapted to bear against said follower to force it against the spring.

4. A flue cutting tool, comprising a stock adapted to t within the ue, a cutter secured to said stock, end bars se cured to said stock, one of said bars being adapted for use in turning the stock, a washer adapted to t on the other bar, a springr encircling said bar and adapted `to bear against said Washer, a follower slidingly mounted on the bar back of the spring and bearing thereagainst, and an eccentric lever fulcrumed on the bar and adapted to bear against said follower to force it against the spring, said follower being formed with oppositely extending studs and the eccentric lever being formed with two members bearing against said studs.

5. A flue cutting tool comprising a stock adapted to iit within a ue, a cutter secured to said stock, bars secured to the ends of said stock, a washer slidingly mounted on one ot said bars, a springl encircling the bar back of the Washer, a follower' slidingly mounted on the bar back of the spring and provided with oppositely extending studs, a collar mounted on the bar hack of the follower and' adapted to `be held at different adjustments on said bar, and a forked eccentric lever fulcrumed on said collar and provided with two eccentrics engaging said studs.

In testimony whereof I afiix my signature in presence of two witnesses.

GILBERT SORENSON. [L. s.]

Witnesses E. M. PnTToN, MYRABEL S. KNIGHT. 

